16. Template specialization

• Sometimes, you want certain template parameter types to be treated in a special way.

• Usually, this is for efficiency.

• As with function names, this is like overloading:

  
      //  General version comes first:
      template < typename ValueT >
      class Stack< ValueT > {
          //...
      };
  
      // Specialization for char follows:
      template < >
      class Stack< char > {
          //...
      };